Question for mommies

Hello mums, I have hand pain, especially in the night , when I lay down my full body joints aches which sometimes keeps me awake throughout the night, it make my body feel weak, I have done all the lab tests, but nothing seems to be deficit, also Dr has ruled out autoimmune diseases with the tests, have also checked with orthopedic and neurologist.
I am breastfeeding my second child for 11months n I haven’t got my periods yet, could it be cause of hormones? Did anyone else had this? What made you feel better?